Data corruption is the damage of information due to various hardware or software fails. After a file gets damaged, it will no longer work as it should, so an application will not start or shall give errors, a text file can be partially or entirely unreadable, an archive file will be impossible to open and then unpack, etc. Silent data corruption is the process of information getting harmed without any identification by the system or an admin, that makes it a significant problem for website hosting servers as problems are very likely to happen on larger in size hard disk drives where considerable volumes of information are stored. In case a drive is a part of a RAID and the data on it is replicated on other drives for redundancy, it's very likely that the bad file will be treated as a good one and it will be copied on all of the drives, making the damage permanent. Lots of the file systems which operate on web servers these days often are unable to recognize corrupted files immediately or they need time-consuming system checks through which the server isn't working.